diff --git a/nixos/modules/services/audio/slimserver.nix b/nixos/modules/services/audio/slimserver.nix
index 8f94a2b49404..21632919699c 100644
--- a/nixos/modules/services/audio/slimserver.nix
+++ b/nixos/modules/services/audio/slimserver.nix
@@ -63,6 +63,7 @@ in {
         description = "Slimserver daemon user";
         home = cfg.dataDir;
         group = "slimserver";
+        isSystemUser = true;
       };
       groups.slimserver = {};
     };